Integer overflow in the CYImage::LoadJPG method in YImage.dll in Yahoo! Messenger before 11.5.0.155, when photo sharing is enabled, might allow remote attackers to execute arbitrary code via a crafted JPG image that triggers a heap-based buffer overflow.

Heap-based buffer overflow in Kakadu kdu_v32m.dll in Yahoo! Messenger 8.1.0.413 allows remote attackers to cause a denial of service (application crash) via a certain length field in JPEG2000 data, as demonstrated by sending an "invite to view my webcam" request, and then injecting a DLL into the attacker's peer Yahoo! Messenger application when this request is accepted.